3M 7000121509 Weatherban Sealant Tape 5354 Black

Product Description

The 3M 7000121509 is a black solid-extrusion sealant tape sold under the Weatherban 5354 product line. It delivers aggressive tack out of the box, making it ready to seal without additional adhesive prep. The tape is formulated with low moisture vapor transmission and exceptional cold flow resistance, keeping seals intact under sustained compression loads. Each roll measures 3/8 inches wide by 1/8 inches thick by 50 feet long and weighs 1.41 pounds. It is suited for glazing, fenestration, and curtainwall work where a durable, weather-resistant seal between dissimilar materials is required.

This tape is designed for sealing applications between glass and metal substrates and also bonds reliably to EPDM rubber. Typical use cases include window and door perimeter sealing, storefront glazing, and metal panel joints in both residential and commercial construction. It is commonly installed by glaziers, window fabricators, and general contractors working on building envelope assemblies. The solid extrusion profile allows it to conform to minor surface irregularities under clamping or fastening pressure.

Key Features

• Solid black extrusion with aggressive initial tack for immediate adhesion
• Exceptional cold flow resistance maintains seal under long-term compression
• Low moisture vapor transmission helps protect interior assemblies from water intrusion
• Adheres to glass, metal, and EPDM rubber substrates
• 50-foot roll length reduces splicing in continuous run applications
• 1/8 inch thickness accommodates standard glazing gap tolerances

Compatibility

Designed for use in glass-to-metal and glass-to-EPDM sealing applications typical of commercial and residential fenestration, curtainwall, and storefront assemblies.

Installation Notes

Installation is performed by glaziers or envelope contractors following manufacturer surface-prep requirements. Substrates should be clean, dry, and free of oils or loose material before tape application. Apply firm, uniform pressure across the full tape width to activate adhesion and ensure full contact. Follow applicable building codes and sealant manufacturer guidelines for joint design and backup material use.

Technical Specifications

• Color: Black
• Width: 3/8 inches
• Thickness: 1/8 inches
• Length: 50 feet
• Weight: 1.41 pounds
• Unit of Measure: Roll
• UPC: 00021200214899

Standard Information

• Brand: 3M
• Manufacturer Part Number: 7000121509